<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>二维数组</title>
</head>
<body>
    <p>二维数组：数组中的元素还是数组。</p>
    <script>
        var arr = [[1,2,3],[4,5,6],[7,8,9]];
        console.log(arr);
        console.log(arr[0][2]);//3
    </script>
</body>
</html>